I Symbol
The latin letter i is used in mathematics to represent the complex part of a complex number. The symbol is also used in computing and some operators as an index variable.
Format  Display  Data 

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Unicode  i 

Usage
Imaginary Number  Notation
The letter i is used in mathematics to represent the square root of negative one.
Complex Number  Notation
A complex number is represented in two parts. The first is the real number part and the second is the imaginary number part.